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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 600 · 40 sums
TalentJR

The method (Column by column): Line up ones, tens and hundreds. Add from the right; 10 or more → carry 1 to the next column. Subtract from the right; top digit smaller → borrow 1 from the next column. Missing number in an addition = total − the number you know.

NameDateTime takenScore ___ / 40
  1. 1.A train has 309 people in the front coaches and 266 people in the back coaches. How many people are on the train?
  2. 2.847 − 108 =
  3. 3.? − 512 = 274
  4. 4.101 + ? = 485
  5. 5.? − 333 = 499
  6. 6.A school has 280 children. 258 of them are girls. How many boys are there?
  7. 7.442 + 340 =
  8. 8.846 + 134 =
  9. 9.717 + 267 =
  10. 10.A train has 733 people in the front coaches and 154 people in the back coaches. How many people are on the train?
  11. 11.977 − ? = 719
  12. 12.? + 319 = 614
  13. 13.753 + 123 =
  14. 14.A school has 615 children. 503 of them are girls. How many boys are there?
  15. 15.? + 117 = 781
  16. 16.A train has 865 people in the front coaches and 104 people in the back coaches. How many people are on the train?
  17. 17.A train has 314 people in the front coaches and 645 people in the back coaches. How many people are on the train?
  18. 18.? − 449 = 65
  19. 19.A train has 791 people in the front coaches and 158 people in the back coaches. How many people are on the train?
  20. 20.810 − 478 =
  21. 21.A train has 197 people in the front coaches and 670 people in the back coaches. How many people are on the train?
  22. 22.515 − ? = 192
  23. 23.333 + ? = 555
  24. 24.227 − 105 =
  25. 25.139 + 322 =
  26. 26.402 + 175 =
  27. 27.A school has 743 children. 578 of them are girls. How many boys are there?
  28. 28.? − 393 = 331
  29. 29.443 + ? = 618
  30. 30.318 + ? = 668
  31. 31.A school has 816 children. 430 of them are girls. How many boys are there?
  32. 32.578 − 105 =
  33. 33.? + 133 = 945
  34. 34.439 − 317 =
  35. 35.A train has 168 people in the front coaches and 649 people in the back coaches. How many people are on the train?
  36. 36.371 − 233 =
  37. 37.638 + 201 =
  38. 38.? + 189 = 300
  39. 39.809 + 111 =
  40. 40.328 − 318 =

Answer key

  1. 575
  2. 739
  3. 786
  4. 384
  5. 832
  6. 22
  7. 782
  8. 980
  9. 984
  10. 887
  11. 258
  12. 295
  13. 876
  14. 112
  15. 664
  16. 969
  17. 959
  18. 514
  19. 949
  20. 332
  21. 867
  22. 323
  23. 222
  24. 122
  25. 461
  26. 577
  27. 165
  28. 724
  29. 175
  30. 350
  31. 386
  32. 473
  33. 812
  34. 122
  35. 817
  36. 138
  37. 839
  38. 111
  39. 920
  40. 10

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